12561401 has 2 divisors, whose sum is σ = 12561402. Its totient is φ = 12561400.

The previous prime is 12561397. The next prime is 12561431. The reversal of 12561401 is 10416521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11215801 + 1345600 = 3349^2 + 1160^2 .

It is a cyclic number.

It is not a de Polignac number, because 12561401 - 2² = 12561397 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12561431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6280700 + 6280701.

It is an arithmetic number, because the mean of its divisors is an integer number (6280701).

Almost surely, 2^12561401 is an apocalyptic number.

It is an amenable number.

12561401 is a deficient number, since it is larger than the sum of its proper divisors (1).

12561401 is an equidigital number, since it uses as much as digits as its factorization.

12561401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 12561401 is about 3544.2066813322. The cubic root of 12561401 is about 232.4588187748.

Adding to 12561401 its reverse (10416521), we get a palindrome (22977922).

The spelling of 12561401 in words is "twelve million, five hundred sixty-one thousand, four hundred one".